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Fast Identity-Based Encryption Using Combined Public Keys
Jiqiang Liu 1 *,Sheng Zhong 2
1.Computer and Information Technology Department, Beijing Jiaotong University
2.Computer Science and Engineering Department, State University of New York at Bu產lo Amherst NY
*Correspondence author
#Submitted by
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Funding: NSF,863 Program,973 Program,Research foundations of Beijing Jiaotong University（No.CNS-0524030,(2007AA01Z410,2007AA01Z177),2007CB307101,K08J0030）
Opened online:20 March 2009
Accepted by: none
Citation: Jiqiang Liu,Sheng Zhong.Fast Identity-Based Encryption Using Combined Public Keys[OL]. [20 March 2009] http://en.paper.edu.cn/en_releasepaper/content/30527
 
 
Identity-based encryption (IBE) is a very useful tool in cryptography. It has many potential applications. However, existing IBE schemes are signicantly slower than regular public key cryptosystems; thus, they may not be able to meet the need of some applications in practice. In this paper, we propose a simple IBE scheme, using a technique of combined public keys. Our IBE scheme is very fast, having time costs close to those of a regular public key cryptosystem, the ElGamal cryptosystem. We show that our IBE scheme is semantically secure under the Decisional Diffie-Hellman (DDH) Assumption. In addition, we give an identity-based signature scheme using the same technique.
Keywords:Identity-based encryption;chosen ciphertext attack;discrete logarithm problem;combined public key
 
 
 

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